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Add IPv6 support #92

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Add IPv6 support #92

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16 changes: 16 additions & 0 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -193,6 +193,22 @@ Con:

Doesn't support older versions of Ubuntu, and the command is a bit more complicated. But you can use my script.

### IPv6

[Enable IPv6 support](https://forums.docker.com/t/docker-user-chain-for-ip6tables/133961/3) in Docker by specifying ULA range (RFC 4193) in `/etc/docker/daemon.json`
```json
{
"experimental": true,
"ipv6": true,
"ip6tables": true,
"fixed-cidr-v6": "fd00:dead:beef::/48"
}
```

Restart Docker
```shell
systemctl restart docker
```

### Conclusion

Expand Down
80 changes: 78 additions & 2 deletions ufw-docker
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Original file line number Diff line number Diff line change
Expand Up @@ -24,7 +24,7 @@ fi
test -n "$ufw_docker_agent_image"

function ufw-docker--status() {
ufw-docker--list "$GREP_REGEXP_INSTANCE_NAME"
ufw-docker--list "$GREP_REGEXP_INSTANCE_NAME" | uniq
}

function ufw-docker--list() {
Expand All @@ -42,13 +42,19 @@ function ufw-docker--list() {
NETWORK="[[:graph:]]*"
fi

# IPv4
ufw status numbered | grep "# allow ${INSTANCE_NAME}\\( ${INSTANCE_PORT}\\/${PROTO}\\)\\( ${NETWORK}\\)\$" || \
ufw status numbered | grep "# allow ${INSTANCE_NAME}\\( ${INSTANCE_PORT}\\/${PROTO}\\)\$" || \
ufw status numbered | grep "# allow ${INSTANCE_NAME}\$"

# IPv6
ufw status numbered | grep "# allow ${INSTANCE_NAME}_IPv6\\( ${INSTANCE_PORT}\\/${PROTO}\\)\\( ${NETWORK}\\)\$" || \
ufw status numbered | grep "# allow ${INSTANCE_NAME}_IPv6\\( ${INSTANCE_PORT}\\/${PROTO}\\)\$" || \
ufw status numbered | grep "# allow ${INSTANCE_NAME}_IPv6\$"
}

function ufw-docker--list-number() {
ufw-docker--list "$@" | sed -e 's/^\[[[:blank:]]*\([[:digit:]]\+\)\].*/\1/'
ufw-docker--list "$@" | sed -e 's/^\[[[:blank:]]*\([[:digit:]]\+\)\].*/\1/' | uniq
}

function ufw-docker--delete() {
Expand All @@ -68,6 +74,7 @@ function ufw-docker--allow() {
die "Docker instance \"$INSTANCE_NAME\" doesn't exist."

mapfile -t INSTANCE_IP_ADDRESSES < <(docker inspect --format='{{range .NetworkSettings.Networks}}{{.IPAddress}}{{"\n"}}{{end}}' "$INSTANCE_NAME" 2>/dev/null | remove_blank_lines)
mapfile -t INSTANCE_IP_V6_ADDRESSES < <(docker inspect --format='{{range .NetworkSettings.Networks}}{{.GlobalIPv6Address}}{{"\n"}}{{end}}' "$INSTANCE_NAME" 2>/dev/null | remove_blank_lines)

[[ -z "${INSTANCE_IP_ADDRESSES:-}" ]] && die "Could not find a running instance \"$INSTANCE_NAME\"."

Expand All @@ -92,6 +99,17 @@ function ufw-docker--allow() {
ufw-docker--add-rule "$INSTANCE_NAME" "$IP" "${PORT_PROTO%/*}" "${PORT_PROTO#*/}" "${INSTANCE_NETWORK}"
RETVAL="$?"
done

ITER_V6=0
for IP in "${INSTANCE_IP_V6_ADDRESSES[@]}"; do
INSTANCE_NETWORK="${INSTANCE_NETWORK_NAMES[$ITER_V6]}"
ITER_V6=$((ITER_V6+1))
if [[ -n "$NETWORK" ]] && [[ "$NETWORK" != "$INSTANCE_NETWORK" ]]; then
continue
fi
ufw-docker--add-rule "${INSTANCE_NAME}_IPv6" "$IP" "${PORT_PROTO%/*}" "${PORT_PROTO#*/}" "${INSTANCE_NETWORK}"
RETVAL="$?"
done
fi
done
if [[ "$RETVAL" -ne 0 ]]; then
Expand Down Expand Up @@ -290,13 +308,20 @@ function ufw-docker--raw-command() {
}

after_rules="/etc/ufw/after.rules"
after6_rules="/etc/ufw/after6.rules"

function ufw-docker--check() {
err "\\n########## iptables -n -L DOCKER-USER ##########"
iptables -n -L DOCKER-USER

err "\\n\\n########## diff $after_rules ##########"
ufw-docker--check-install && err "\\nCheck done."

err "\\n########## ip6tables -n -L DOCKER-USER ##########"
ip6tables -n -L DOCKER-USER

err "\\n\\n########## diff $after6_rules ##########"
ufw-docker--check-install_ipv6 && err "\\nCheck IPv6 done."
}

declare -a files_to_be_deleted
Expand Down Expand Up @@ -352,6 +377,43 @@ function ufw-docker--check-install() {
diff -u --color=auto "$after_rules" "$after_rules_tmp"
}

function ufw-docker--check-install_ipv6() {
DOCKER_IPV6_NETWORK=$(sed -En 's/.*"fixed-cidr-v6":.?"([^"]*).*/\1/p' /etc/docker/daemon.json)
[[ -z "${DOCKER_IPV6_NETWORK:-}" ]] && die "Could not find \"fixed-cidr-v6\" in \"/etc/docker/daemon.json\"."

after6_rules_tmp="${after6_rules_tmp:-$(mktemp)}"
rm-on-exit "$after6_rules_tmp"

sed "/^# BEGIN UFW AND DOCKER/,/^# END UFW AND DOCKER/d" "$after6_rules" > "$after6_rules_tmp"
>> "${after6_rules_tmp}" cat <<-\EOF
# BEGIN UFW AND DOCKER
*filter
:ufw6-user-forward - [0:0]
:ufw6-docker-logging-deny - [0:0]
:DOCKER-USER - [0:0]
-A DOCKER-USER -j ufw6-user-forward

-A DOCKER-USER -j RETURN -s {DOCKER_IPV6_NETWORK}

-A DOCKER-USER -p udp -m udp --sport 53 --dport 1024:65535 -j RETURN

-A DOCKER-USER -j ufw6-docker-logging-deny -p tcp -m tcp --tcp-flags FIN,SYN,RST,ACK SYN -d {DOCKER_IPV6_NETWORK}
-A DOCKER-USER -j ufw6-docker-logging-deny -p udp -m udp --dport 0:32767 -d {DOCKER_IPV6_NETWORK}

-A DOCKER-USER -j RETURN

-A ufw6-docker-logging-deny -m limit --limit 3/min --limit-burst 10 -j LOG --log-prefix "[UFW DOCKER BLOCK] "
-A ufw6-docker-logging-deny -j DROP

COMMIT
# END UFW AND DOCKER
EOF

sed -i "s/{DOCKER_IPV6_NETWORK}/${DOCKER_IPV6_NETWORK/\//\\/}/g" "$after6_rules_tmp"

diff -u --color=auto "$after6_rules" "$after6_rules_tmp"
}

function ufw-docker--install() {
if ! ufw-docker--check-install; then
local after_rules_bak
Expand All @@ -366,6 +428,20 @@ function ufw-docker--install() {
err " sudo service ufw restart"
fi
fi

if ! ufw-docker--check-install_ipv6; then
local after6_rules_bak
after6_rules_bak="${after6_rules}-ufw-docker~$(date '+%Y-%m-%d-%H%M%S')~"
err "\\nBacking up $after6_rules to $after6_rules_bak"
cp "$after6_rules" "$after6_rules_bak"
cat "$after6_rules_tmp" > "$after6_rules"
err "Please restart UFW service manually by using the following command:"
if type systemctl &>/dev/null; then
err " sudo systemctl restart ufw"
else
err " sudo service ufw restart"
fi
fi
}

function ufw-docker--help() {
Expand Down